I have been doing some research when I ran across Sodium Bicarbonate (Baking Soda) which raises the pH of water and may be what I am looking for. (Experiment time!)
A pH of about 8.3 might be enough to discourage growth in the water (growth doesn't like alkaline solutions much) and make conditions less than ideal for corrosion. A pH of 8.3 combined with coppers comparatively slow natural corrosion rate in water might provide sufficient corrosion protection.
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I can't spell, but I am working on it.
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